Stomach sleeper here, and with arms overhead sometimes or beside head at least. I like a quilt much better (never tangled up).
I don't use a quilt to save weight. I don't need a warmer rated quilt to stay warm, but for how I sleep, I definitely need a quilt that is "at least" one size if not two sizes wider than recommended by the manufacturer. I think this is key for some people. I have only awakened cold briefly a few times,
and just when sweating because I have the extra wide quilt edges wrapping under me and don't have enough ventilation for the outside temps.
I use a small pillow under my chest. Go longer in the quilt as stated above if you will have your arms up near your head and you are near the upper end of manufacturer recommended length.
I never put my head inside the quilt to avoid increased moisture, but do use the puffy hoods with strap under arms for temps below 25 degrees. A fleece hat is just not enough.